Levelling tool



March 30, 1948. HQLLANDER 2,438,558

LEVELLING TOOL Filed Sept. 24, 1945 2 Sheets-Sheet 1 arm AH: 4 rr' March 30, 1948. N. B. F. HOL'LANDER 2,438,558

LEVELLING TOOL Filed Sept. 24, 1945 2 Sheets-Sheet 2 Patented Mar. 30, 1948 LEVELLING TOOL Nils Berti! 'Fredrik Hollander, vSt- :Essingen. Sweden Application September 24, 1945, Serial No. 618,283 In Sweden September 15, 1944 4 Claims. 1

The present invention relates to a tool with retractable cutter for levelling from below the sur face around a hole and is substantially characterized by the fact that the cutter is s-wingabl-y fixed on apiston which is axially displaceable in a cylindric portion of the tool, the said cylindric portion being adapted to he .pushedthrough the hole whose underside is to 'be levelled, the said piston Zbeing connected with the cylindric portion in such a way that, when the piston has been pushed to an end position in the cylindric portion, the cutter has been swung out to working position through an axial groove in the said portion. The invention eliminates the drawbacks which are connected with-the apparatus now x used in boring machines for levelling from below the surface around bolt holes in flanges :or .the like, in order to form a suitable contact surface for the bolt head or bolt nut, which often occurs in moulded constructions, such as bearing boxes, frames or the like, the said drawbacks being due to the fact that the levelling tool in the boring machine must operate from below upwards. In the known devices the boring rod has a transverse rectangular groove in which, after the boring rod has been pushed down through the bored hole, the cutter is inserted and fixed by a screw. After the lower surface has been levelled, the boring machine is to be stopped, the screw detached and the cutter taken out, whereafter the boring rod is pushed down in the next hole and the procedure is repeated. All this requires much time, not to speak of the necessity of having a suitable wrench at hand. When the cutter is to be removed there is also the risk of accidents which have occurred more than once because the boring machine has started for some reason or other. The method is obviously primitive and expensive, and it has been a general wish to ob tain a device which eliminates the long time required for the manual work as well as the possi bilities of accidents, and which makes the tool as handy as possible.

The invention satisfies all the demands of a tool of this kind in the abovementioned respects. In practical use it has appeared that the work with the same is made quickly and without risks by a single manipulation, the abovementioned time required for manual work being considerably reduced. The necessary operations can be made while the machine is running.

An embodiment of the invention is illustrated on the accompanying drawing, in which:

Fig. 1 is a partial section of the apparatus with the cutter in working position.

Fig. '2 is .a partially sectioned view taken at right angles to Fig. 1.

Fig. .3 is a partially sectioned view with retracted cutter.

Fig. i is a section .on line IV-..-I:V in Fig. 1, and

Fig. 5 is a section on line VV in Fig. 1

Fig. 6 is a partially sectioned view showing .how the tool is used.

The main part of the tool, the spindle, consists of a portion l of standard construction with conical upper .end and adapted to gfill .in the boring machine in question, of a lower cylindric portion 12 having a diameter ,equal .to the outer diameter of the screw or bolt, and .of an intermediate cylindric portion v3 fitting the hole in the operating ring 4.1 The cylindric portion ,2 is pro.- vided with the bore 5 in which the piston I is located, the :said piston :being out up to receive the cutter 6. The piston I is at the lower end fork-shaped and the prongs are provided with the bore 8 in which the pin 9 is inserted. The pin 9 also fits in a hole in the cutter 6, the said cutter being suspended by means of the pin 9 between the prongs of the fork formed by the cut up piston I. The piston 1 which can glide in the axial direction in the hole 5, has in its upper end a hole It in which the pin II is fitted. A groove I2 is made in the cylindric portion 3, in order that the pin I I and thus the piston I shall be displaceable in the axial direction as far as admitted by the groove [2. The pin ll lies with its both ends in the turned groove I3 in the ring 4. The pin H is inserted in its place through the hole M in the ring 4 which can rotate around the cylindric portion 3 after the pin II has come in its correct position. In the cylindric portion 2 there is a groove IS in which the cutter 6 fits. In the cylindric portion 3 there are turned three ring grooves l6, l1 and I8 which correspond to three positions of the piston I and which are fixed by the ball H! which is depressed by the spring 20 into the grooves I8, I'I

. and I8 when they pass the ball I9. The groove it corresponds to the upper position of the piston I, the groove H to the lower position of the piston and the groove 18 which is less deep than it and I1, to the position of the piston I when the hole 8 in the cutter 6 is in front of the hole 2! in the cylindric portion 2. In this position the pin 9 can be pushed out and the steel 6 be removed. In the piston I there is riveted the plate spring 22 which exerts a permanent pressure on the cutter 6 when the latter is in the retracted position. The upper edge 23 of the groove [5 is fitted in such a way that the cutter 6 strikes into the groove l7.

against the same when the piston I is drawn upwards, the cutter 6 turning around the pin 9 in order to, when the piston I has been completely drawn up, assume the position shown in the right one of the three longitudinal sections (Fig. 3). The ball [9 is then located in the groove l6. s

When the tool is'to be used and'the initial position is the one shown in Fig. 1, for example (the ball is then-located in the groove H), the ring 4 is drawn upwards. The piston I then obtains an upward movement because the groove l3 forces the pin .II and. thus the piston l upwards. After a few moments the cutter 6 strikes against the edge 23 in the groove 15, the cutter 6 turning around the pin 9 in orderrto, When the ball I9 has come into the groove 16, assume the position shown in Fig. 1. The cylindric portion 2 can now be inserted in the hole the underside of which is to be levelled. The ring! is now depressed, the

plate spring 22 pressing out the cutter 6 through the groove I whereafter the cutter 6 returns to the initial position when the ball 19 has come This position is shown in Fig. 6. The levelling can now be made whereafter the procedure is repeated.

These manipulations are made in a very short time, and according to calculations only of the time which is now required with usual tools, need be used.

The details of the invention described above and illustrated on the drawing can of course be varied in some respect or other without going beyond the scope of the invention.

' Having now described my invention, what I claim asnew and desire tosecure by Letters Patent is:

1. A cutting tool comprising a tool holder, a

cutter pivotally mounted centrally thereof on said holder and a cylindrical body in which said.

holder is axially adjustable, said body having parallel slots longitudinally disposed on either side of its lower end so that as said holder is lowered in said body the cutter projects out of said body to dispose its cutting edges on either side ,I of the body, the top edge of oneof said slotsbeing lower than the top edge of the other of said for axial movement therewith,

3. A cutting tool as claimed in claim 1 comprising spring means disposed in said cylindrical body and pressing against one end of said cutter to cause said cutter to pivot on said tool holder and project out of said body when said holder is lowered. 4. A cutting tool as claimed in claim 1 in which said lower top edge is tapered for engagement with said cutter.

NILS BERTIL FREDRIK HOLLANDER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 7 214,720 Shur 1 Apr. 22, 1879 1,392,960 Mizzell Oct. 11, 1921 2,229,094 Knox Jan. 21, 1941 2,314,034 Fried Mar. 16, 1943 

